采用高温固相法制备了一系列Gd2Ba3B3O12∶Tb3+绿色荧光粉, 借助X射线粉末衍射仪(XRD)、 真空紫外光谱和荧光光谱仪(VUV-UV)对样品的物相、 发光性能进行了表征。 结果表明, Tb3+作为发光中心全部进入到基质Gd2Ba3B3O12的晶格中并占据Gd3+的位置。 样品Gd2Ba3B3O12∶Tb3+的VUV-UV激发光谱主要由160～200 nm和200～250 nm的宽峰以及260～280 nm和300～320 nm的锐利峰组成。 宽峰是由于基质吸收和Tb3+的f—d的跃迁形成的, 锐利峰是由于Tb3+和Gd3+的f—f特征跃迁形成。 样品Gd2Ba3B3O12∶ Tb3+的最强发射峰位于543 nm, 对应于Tb3+的5D4→7F5跃迁。 在172 nm激发下, 样品Gd1.85Tb0.15Ba3B3O12的发光强度最强, 其色坐标为(0.313 6, 0.484 3), 衰减时间为2.98 ms, 可作为绿色荧光粉应用于等离子体显示器(PDP)领域。

The green emitting phosphor, Gd2Ba3B3O12∶Tb3+ was synthesized with the method of high-temperature solid-state reaction. The phase structure and photoluminescence (PL) properties of the samples were characterized by The X-ray diffraction (XRD), vacuum ultraviolet spectrum and ultraviolet spectrum (VUV-UV). The results indicate that Tb3+ ion acting as the luminescent center inhabited the site of Gd3+ ion in the host of Gd2Ba3B3O12. The VUV-UV excitation spectrum consists of the two strong broad bands at about 160～200 and 200～250 nm and sharp lines at about 260～280 and 300～ 320 nm. The two strong broad bands were assigned to the host absorption and f—d transition of Tb3+. The sharp lines were ascribed to the f—f transition of Tb3+ and Gd3+. All the samples of Gd2Ba3B3O12∶Tb3+ exhibit strong green emission corresponding to 5D4→7F5 transition (543 nm) of Tb3+ under VUV-UV light excitation. Under 172 nm excitation, 15 mol% Tb3+ doped Gd2Ba3B3O12 sample exhibits strong green emission with good color purity (x=0.313 6, y=0.484 3) and a fitted a decay time τ around 2.98 ms. It can be concluded that this series of phosphors Gd2Ba3B3O12∶Tb3+ is a promising green vacuum ultraviolet (VUV) phosphor for plasma display panels (PDPs) and Hg-free fluorescent tubes application.